2016年南昌市PM_(10)和PM_(2.5)质量浓度变化研究

The Analysis of the Characteristics of PM_(10) and PM_(2.5) Mass Concentration Changing in Nanchang in 2016

利用南昌市2016年4月～2017年3月8个监测点的PM_(10)和PM_(2.5)质量浓度的监测数据,通过聚类分析探讨了大气颗粒物PM_(10)、PM_(2.5)的污染状况和不同功能区间的变化规律.结果表明:2016年南昌市大气颗粒污染物中,细颗粒物(PM_(2.5))较可吸入颗粒物(PM_(10))超标情况更严重;从时间角度看,PM_(10)和PM_(2.5)浓度表现为冬季>春季/秋季>夏季的季节性变化趋势;从空间角度看,表现为商业交通居住混合区>交通区>文教区>居住区>风景区的变化规律;PM_(2.5)/PM_(10)比值变化特征提示冬季可吸入颗粒物中细颗粒物所占比重最大,春季和秋季次之,夏季最小;在影响因素中,监测点大气颗粒物的浓度受交通环境的影响最大,受居民日常生活排污的影响次之.

With cluster analysis and comparative study,the research studies PM 2.5 and PM 10 pollution and the variation rules of different functional zone,based on the data that monitored by 8 monitoring points of Nanchang from April 2016 to March 2017.The result shows that the over-standard rate of PM 2.5 is higher than PM 10 among the atmospheric particulate pollutants in Nanchang,in 2016;the concentrations of PM 10 and PM 2.5 in time distribution show that in winter>spring/autumn>summer,spatially expressed as commercial traffic mixed area>traffic area>cultural and educational area>residential area>scenic area.The ratio changes of PM 2.5 to PM 10 show that the highest fine particulate(PM 2.5)content is in winter,followed by spring and autumn,summer at the last.Among the influence factors,the concentrations of particulate matter at the monitoring points are mostly affected by traffic,and the second factor is daily discharge of residents.